The factors of the number 15,323,220 are: 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15, 18, 20, 22, 30, 33, 36, 44, 45, 55, 60, 66, 71, 90, 99, 109, 110, 132, 142, 165, 180, 198, 213, 218, 220, 284, 327, 330, 355, 396, 426, 436, 495, 545, 639, 654, 660, 710, 781, 852, 981, 990, 1065, 1090, 1199, 1278, 1308, 1420, 1562, 1635, 1962, 1980, 2130, 2180, 2343, 2398, 2556, 3124, 3195, 3270, 3597, 3905, 3924, 4260, 4686, 4796, 4905, 5995, 6390, 6540, 7029, 7194, 7739, 7810, 9372, 9810, 10791, 11715, 11990, 12780, 14058, 14388, 15478, 15620, 17985, 19620, 21582, 23217, 23430, 23980, 28116, 30956, 35145, 35970, 38695, 43164, 46434, 46860, 53955, 69651, 70290, 71940, 77390, 85129, 92868, 107910, 116085, 139302, 140580, 154780, 170258, 215820, 232170, 255387, 278604, 340516, 348255, 425645, 464340, 510774, 696510, 766161, 851290, 1021548, 1276935, 1393020, 1532322, 1702580, 2553870, 3064644, 3830805, 5107740, 7661610, 15323220.
If you add them up, you will get the total of 51,891,840.